The projections from the cell that move materials and mucus are called cilia.

Here's why:

* Cilia are hair-like structures that extend from the surface of certain cells. They move in a coordinated, wave-like motion.

* Their function is to:

* Move fluids and particles: This includes mucus, which is important for trapping debris and pathogens in the respiratory system.

* Propel the cell itself: Some single-celled organisms use cilia for locomotion.

Other structures you might be thinking of:

* Flagella: These are longer, whip-like projections that are usually present in single numbers. They are responsible for movement in some cells, like sperm cells.

* Microvilli: These are tiny, finger-like projections that increase the surface area of cells for absorption.

Let me know if you have any more questions about cell structures!